You know how if you want to conserve your iPhone’s battery life, it’s a good idea to open the multitasking window and swipe non-relevant apps off the screen?

Yeah, that doesn't really work.

At least according to a man who should know. When iPhone-user Caleb sent an email (obtained by 9to5 Mac) to Apple CEO Tim Cook, asking, “do you quit your iOS multitasking apps frequently and is this necessary for battery life?,” he didn’t receive a reply from Cook himself.